A type of roundworm infection.

Trichinosis infection, sometimes called trichinellosis, is caused by roundworm parasites. It spreads to humans when people eat raw or undercooked meat infected with the parasite. Over weeks, the larvae from the meat grow into adult worms in the human intestine.

People with a mild infection may have no symptoms. More serious infections can cause symptoms 1 to 2 days after infection. People might have loose stools, stomach pain, tiredness and vomiting. Roundworms that infect muscle tissue also can cause longer term symptoms. These include high fever and chills, aching joints, and muscle pain or tenderness.

Trichinosis can get better without treatment. Anti-parasitic medicines may be used for infections caught early or infections that cause problems in the brain, heart or lung. Pain relief medicine can help with muscle aches and swelling.